20MnCrNi2MoRE耐磨铸钢连续冷却转变曲线的测定  

Measurement of continuous cooling transformation curve of 20MnCrNi2MoRE wear resistant cast steel

作　　者：刘新华[1,2] 计云萍[1] 任慧平[1,2] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《金属热处理》2015年第1期178-181,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(51261018);内蒙古自然科学基金(2012MS0805);内蒙古科技大学创新基金(2011NCL037)

摘　　要：以膨胀法为主、金相法和硬度法为辅测定并绘制出20Mn Cr Ni2MoRE耐磨铸钢的CCT曲线。结果表明,20Mn Cr Ni2MoRE耐磨铸钢的临界点为:Ac1=699℃,Ac3=844℃,Ms=368℃;20Mn Cr Ni2MoRE耐磨铸钢的CCT曲线只有贝氏体转变区和马氏体转变区,而无先共析铁素体的析出和珠光体转变区,其淬火临界冷却速率为6℃/s,当冷却速率为0.03~6℃/s时,组织转变类型有贝氏体转变和马氏体转变两种,当冷却速率大于6℃/s时,全部发生马氏体转变。The CCT curve of the tested steel was gained by means of a combined method of dilatometry, metallography and hardness.The results show that, the critical point Ac1 , Ac3 , and Ms of 20MnCrNi2MoRE wear-resistant cast steel are 699, 844, 368 ℃ respectively. There are only two structural transformation zones, bainite transformation zone and martensite transformation zone, and no proeutectoid ferrite precipitation and pearlitic transformation zone in the CCT curve of the tested steel.The critical quenching cooling rate is 6 ℃/s, and there are two kinds of structural transformation-bainite transformation and martensite transformation when the cooling rate is in range of 0.03℃/s to 6 ℃/s, and only martensite transformation occurs when the cooling rate is more than 6 ℃/s.

关 键 词：20MnCrNi2MoRE钢 耐磨铸钢 膨胀法 CCT曲线 

分 类 号：TG142.1[一般工业技术—材料科学与工程]